function dxMessageDlgPos(const AMessage: string; ADialogType: TMsgDlgType; AButtons: TMsgDlgButtons; AHelpContext: Longint; X: Integer; Y: Integer; const AHyperlinkClickProc: TdxMessageDialogHyperlinkClickDelegate = nil; const AShowHyperlinkHintProc: TdxMessageDialogShowHyperlinkHintDelegate = nil): Integer;

uses
  dxMessageDialog, // Declares the dxMessageDlgPos method
  Winapi.Windows; // Declares WinAPI constants
// ...

procedure TMyForm.DemonstrateDxMessageDlgPos1;
var
  AMessage, AHelpURL: string;
  ADialogType: TMsgDlgType;
  AButtons: TMsgDlgButtons;
  AHelpContext, ACloseAction: Integer;
  APointer: TPoint;
begin
  // Define a formatted message with a hyperlink (using the BBCode-inspired markup)
  AHelpURL := 'https://docs.devexpress.com/VCL/dxMessageDialog.dxMessageDlgPos(27D2BCB9)';
  AMessage := '[URL=' + AHelpURL + ']dxMessageDlgPos[/URL] opens a message dialog box ' +
    'at specific screen coordinates ([B]X[/B], [B]Y[/B]). The message box has ' +
    'a formatted message ([B]AMessage[/B]) and a set of buttons ([B]AButtons[/B]).';

  ADialogType := mtInformation; // Defines the "Information" dialog title, icon, and sound
  AButtons := mbYesNoCancel; // Defines a button set (Yes, No, and Cancel)
  AHelpContext := 0; // Retains the default help context
  APointer := Mouse.CursorPos; // Obtains mouse pointer coordinates

  // Display a message box at the mouse pointer position
  ACloseAction :=
    dxMessageDlgPos(AMessage, ADialogType, AButtons, AHelpContext, APointer.X, APointer.Y);

  // Identify the action used to close the message box
  case ACloseAction of
    IDYES: Caption := 'Yes is clicked';
    IDNO: Caption := 'No is clicked';
    IDCANCEL: Caption := 'Cancel is clicked';
    0: Caption := 'Failed to create a message box';
  end;
end;

#include "dxMessageDialog.hpp" // Declares the dxMessageDlgPos method
#include <Winapi.Windows.hpp> // Declares WinAPI constants

// Add the following linker directive to the corresponding CPP source file:
#pragma link "dxMessageDialog" // Required to use dxMessageDialog.hpp declarations
// ...

void __fastcall TMyForm::DemonstrateDxMessageDlgPos1()
{
  UnicodeString AMessage, AHelpURL;
  TMsgDlgType ADialogType;
  TMsgDlgButtons AButtons;
  int AHelpContext, ACloseAction;
  TPoint APointer;

  // Define a formatted message with a hyperlink (using the BBCode-inspired markup)
  AHelpURL = "https://docs.devexpress.com/VCL/dxMessageDialog.dxMessageDlgPos(27D2BCB9)";
  AMessage =
    "[URL=" + AHelpURL + "]dxMessageDlgPos[/URL] opens a message dialog box "
    "at specific screen coordinates ([B]X[/B], [B]Y[/B]). The message box has "
    "a formatted message ([B]AMessage[/B]) and a set of buttons ([B]AButtons[/B]).";

  ADialogType = mtInformation; // Defines the "Information" dialog title, icon, and sound
  AButtons = mbYesNoCancel; // Defines a button set (Yes, No, and Cancel)
  AHelpContext = 0; // Retains the default help context
  APointer = Mouse->CursorPos; // Obtains mouse pointer coordinates

  // Display a message box at the mouse pointer position
  ACloseAction =
    dxMessageDlgPos(AMessage, ADialogType, AButtons, AHelpContext, APointer.X, APointer.Y);

  // Identify the action used to close the message box
  switch (ACloseAction)
  {
    case IDYES: Caption = "Yes is clicked"; break;
    case IDNO: Caption = "No is clicked"; break;
    case IDCANCEL: Caption = "Cancel is clicked"; break;
    case 0: Caption = "Failed to create a message box"; break;
  }
}